package com.jcp.baselibrary.utils;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.media.ExifInterface;
import android.net.Uri;
import android.text.TextUtils;
import android.util.Base64;

import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

/**
 * 图片处理工具类
 *
 * Author: nanchen
 * Email: liushilin520@foxmail.com
 * Date: 2017-03-08  9:03
 */

public class BitmapUtil {

    private BitmapUtil() {
        throw new UnsupportedOperationException("u can't instantiate me...");
    }

    public static Bitmap getScaledBitmap(Bitmap tempBitmap, int desiredWidth, int desiredHeight) {
        // If necessary, scale down to the maximal acceptable size.
        if (tempBitmap != null && (tempBitmap.getWidth() > desiredWidth || tempBitmap.getHeight() > desiredHeight)) {
            Bitmap bitmap = Bitmap.createScaledBitmap(tempBitmap, desiredWidth, desiredHeight, true);
            tempBitmap.recycle();
            return bitmap;
        } else {
            return tempBitmap;
        }
    }

    public static Bitmap getScaledBitmap(Context context, Uri imageUri, float maxWidth, float maxHeight, Bitmap.Config bitmapConfig) {
        String filePath = FileUtil.getRealPathFromURI(context, imageUri);
        Bitmap scaledBitmap = null;

        BitmapFactory.Options options = new BitmapFactory.Options();

        //by setting this field as true, the actual bitmap pixels are not loaded in the memory. Just the bounds are loaded. If
        //you try the use the bitmap here, you will get null.
        options.inJustDecodeBounds = true;
        Bitmap bmp = BitmapFactory.decodeFile(filePath, options);
        if (bmp == null) {
            try {
                InputStream inputStream = new FileInputStream(filePath);
                BitmapFactory.decodeStream(inputStream, null, options);
                inputStream.close();
            } catch (FileNotFoundException exception) {
                exception.printStackTrace();
            } catch (IOException exception) {
                exception.printStackTrace();
            }
        }

        int actualHeight = options.outHeight;
        int actualWidth = options.outWidth;

        if (actualHeight == -1 || actualWidth == -1){
            try {
                ExifInterface exifInterface = new ExifInterface(filePath);
                actualHeight = exifInterface.getAttributeInt(ExifInterface.TAG_IMAGE_LENGTH, ExifInterface.ORIENTATION_NORMAL);//获取图片的高度
                actualWidth = exifInterface.getAttributeInt(ExifInterface.TAG_IMAGE_WIDTH, ExifInterface.ORIENTATION_NORMAL);//获取图片的宽度
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        if (actualWidth <= 0 || actualHeight <= 0) {
            Bitmap bitmap2 = BitmapFactory.decodeFile(filePath);
            if (bitmap2 != null){
                actualWidth = bitmap2.getWidth();
                actualHeight = bitmap2.getHeight();
            }else{
                return null;
            }
        }

        float imgRatio = (float) actualWidth / actualHeight;
        float maxRatio = maxWidth / maxHeight;

        //width and height values are set maintaining the aspect ratio of the image
        if (actualHeight > maxHeight || actualWidth > maxWidth) {
            if (imgRatio < maxRatio) {
                imgRatio = maxHeight / actualHeight;
                actualWidth = (int) (imgRatio * actualWidth);
                actualHeight = (int) maxHeight;
            } else if (imgRatio > maxRatio) {
                imgRatio = maxWidth / actualWidth;
                actualHeight = (int) (imgRatio * actualHeight);
                actualWidth = (int) maxWidth;
            } else {
                actualHeight = (int) maxHeight;
                actualWidth = (int) maxWidth;
            }
        }

        //setting inSampleSize value allows to load a scaled down version of the original image
        options.inSampleSize = calculateInSampleSize(options, actualWidth, actualHeight);

        //inJustDecodeBounds set to false to load the actual bitmap
        options.inJustDecodeBounds = false;

        //this options allow android to claim the bitmap memory if it runs low on memory
        options.inPurgeable = true;
        options.inInputShareable = true;
        options.inTempStorage = new byte[16 * 1024];

        try {
            // load the bitmap getTempFile its path
            bmp = BitmapFactory.decodeFile(filePath, options);
            if (bmp == null) {
                InputStream inputStream = null;
                try {
                    inputStream = new FileInputStream(filePath);
                    BitmapFactory.decodeStream(inputStream, null, options);
                    inputStream.close();
                } catch (IOException exception) {
                    exception.printStackTrace();
                }
            }
        } catch (OutOfMemoryError exception) {
            exception.printStackTrace();
        }
        if (actualHeight <= 0 || actualWidth <= 0){
            return null;
        }

        try {
            scaledBitmap = Bitmap.createBitmap(actualWidth, actualHeight, bitmapConfig);
        } catch (OutOfMemoryError exception) {
            exception.printStackTrace();
        }

        float ratioX = actualWidth / (float) options.outWidth;
        float ratioY = actualHeight / (float) options.outHeight;

        Matrix scaleMatrix = new Matrix();
        scaleMatrix.setScale(ratioX, ratioY, 0, 0);

        Canvas canvas = new Canvas(scaledBitmap);
        canvas.setMatrix(scaleMatrix);
        canvas.drawBitmap(bmp, 0, 0, new Paint(Paint.FILTER_BITMAP_FLAG));

        //check the rotation of the image and display it properly
        ExifInterface exif;
        try {
            exif = new ExifInterface(filePath);
            int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, 0);
            Matrix matrix = new Matrix();
            if (orientation == 6) {
                matrix.postRotate(90);
            } else if (orientation == 3) {
                matrix.postRotate(180);
            } else if (orientation == 8) {
                matrix.postRotate(270);
            }
            scaledBitmap = Bitmap.createBitmap(scaledBitmap, 0, 0,
                    scaledBitmap.getWidth(), scaledBitmap.getHeight(),
                    matrix, true);
        } catch (IOException e) {
            e.printStackTrace();
        }

        return scaledBitmap;
    }

    public static File compressImage(Context context, Uri imageUri, float maxWidth, float maxHeight,
                              Bitmap.CompressFormat compressFormat, Bitmap.Config bitmapConfig,
                              int quality, String parentPath, String prefix, String fileName) {
        FileOutputStream out = null;
        String filename = generateFilePath(context, parentPath, imageUri, compressFormat.name().toLowerCase(), prefix, fileName);
        try {
            out = new FileOutputStream(filename);
            //write the compressed bitmap at the destination specified by filename.
            Bitmap bitmap = BitmapUtil.getScaledBitmap(context, imageUri, maxWidth, maxHeight, bitmapConfig);
            if (bitmap != null) {
                bitmap.compress(compressFormat, quality, out);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } finally {
            try {
                if (out != null) {
                    out.close();
                }
            } catch (IOException ignored) {
            }
        }

        return new File(filename);
    }

    private static String generateFilePath(Context context, String parentPath, Uri uri,
                                           String extension, String prefix, String fileName) {
        File file = new File(parentPath);
        if (!file.exists()) {
            file.mkdirs();
        }
        /** if prefix is null, set prefix "" */
        prefix = TextUtils.isEmpty(prefix) ? "" : prefix;
        /** reset fileName by prefix and custom file name */
        fileName = TextUtils.isEmpty(fileName) ? prefix + FileUtil.splitFileName(FileUtil.getFileName(context, uri))[0] : fileName;
        return file.getAbsolutePath() + File.separator + "Compressed"+ fileName + "." + extension;
    }


    /**
     * 计算inSampleSize
     */
    private static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
        final int height = options.outHeight;
        final int width = options.outWidth;
        int inSampleSize = 1;

        if (height > reqHeight || width > reqWidth) {
            final int heightRatio = Math.round((float) height / (float) reqHeight);
            final int widthRatio = Math.round((float) width / (float) reqWidth);
            inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
        }

        final float totalPixels = width * height;
        final float totalReqPixelsCap = reqWidth * reqHeight * 2;

        while (totalPixels / (inSampleSize * inSampleSize) > totalReqPixelsCap) {
            inSampleSize++;
        }

        return inSampleSize;
    }

    /**
     * 保存图片到文件
     */
    public static boolean saveBmpToFile(Bitmap bitmap, String path, Bitmap.CompressFormat format) {
        if (bitmap == null || bitmap.isRecycled()) return false;
        BufferedOutputStream stream = null;
        try {
            File file = new File(path);
            File filePath = file.getParentFile();
            if (!filePath.exists()) {
                filePath.mkdirs();
            }
            if (!file.exists()) {
                try {
                    file.createNewFile();
                } catch (IOException e) {
                    e.printStackTrace();
                    return false;
                }
            }
            stream = new BufferedOutputStream(new FileOutputStream(file));
            bitmap.compress(format, 100, stream);//将图片压缩的流里面
            stream.flush();// 刷新此缓冲区的输出流
            stream.close();// 关闭此输出流并释放与此流有关的所有系统资源
            return true;
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (null != stream) {
                try {
                    stream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return false;
    }

    /**
     * bitmap转为base64
     *
     * @param bitmap
     * @return
     */
    public static String bitmapToBase64(Bitmap bitmap) {
        byte[] bitmapBytes = bitmapToByteArray(bitmap, true);
        String result = Base64.encodeToString(bitmapBytes, Base64.DEFAULT);;
        return result;
    }

    public static byte[] bitmapToByteArray(final Bitmap bmp, final boolean needRecycle) {
        ByteArrayOutputStream output = new ByteArrayOutputStream();
        bmp.compress(Bitmap.CompressFormat.JPEG, 80, output);
        byte[] result = output.toByteArray();
        try {
            output.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        if (needRecycle) {
            bmp.recycle();
        }
        return result;
    }

    /**
     * base64转为bitmap
     *
     * @param base64Data
     * @return
     */
    public static Bitmap base64ToBitmap(String base64Data) {
        byte[] bytes = Base64.decode(base64Data, Base64.DEFAULT);
        return BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
    }

}
